diff --git a/src/mdbx.c b/src/mdbx.c
index 77799f13..9a70a641 100644
--- a/src/mdbx.c
+++ b/src/mdbx.c
@@ -7828,8 +7828,6 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
         memcpy(olddata.iov_base, data->iov_base, data->iov_len);
       else {
         mdbx_cassert(mc, NUMKEYS(mc->mc_pg[mc->mc_top]) == 1);
-        mdbx_cassert(mc, mc->mc_pg[mc->mc_top]->mp_upper ==
-                             mc->mc_pg[mc->mc_top]->mp_lower);
         mdbx_cassert(mc, IS_LEAF(mc->mc_pg[mc->mc_top]) &&
                              !IS_LEAF2(mc->mc_pg[mc->mc_top]));
         mdbx_cassert(mc, NODEDSZ(leaf) == 0);
@@ -7837,7 +7835,7 @@ int mdbx_cursor_put(MDBX_cursor *mc, MDBX_val *key, MDBX_val *data,
         mdbx_cassert(mc, key->iov_len < UINT16_MAX);
         leaf->mn_ksize = (uint16_t)key->iov_len;
         memcpy(NODEKEY(leaf), key->iov_base, key->iov_len);
-        assert((char *)NODEDATA(leaf) + NODEDSZ(leaf) <
+        assert((char *)NODEKEY(leaf) + NODEDSZ(leaf) <
                (char *)(mc->mc_pg[mc->mc_top]) + env->me_psize);
         goto fix_parent;
       }